Airport Extreme removes port forward settings every reboot

I have set up various port forward settings on my Airport Extreme from OS X Server. However, every time I reboot the Airport, all port forward settings are lost except Contacts, Calendars, and DNS. It gets very troublesome to constantly readd all my settings in there. Port forwards are the only settings that are lost.
Please help!

I found the issue – and it's fairly simple and obviously really.  I'm guessing you were adding the ports from OS X Server in the order they are listed within Server.app (where they are listed in alphabetical order).  After Calendar, Contacts and DNS is "File Sharing".
If this is enabled, whilst File Sharing is enabled on the AirPort Extreme, the port forwarding entry for File Sharing, and anything below is removed.
Simply disable "File Sharing" from AirPort Utility before continuing (as recommended by Server.app when setting up the service for File Sharing).
I understand you replaced your AE and no longer have the issue – I thought I'd leave the explanation should others encounter it.

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